test_lls_test, a FORTRAN90 code which calls test_lls(), which implements linear least squares (LLS) test problems which are given A and b, and seek a vector x which minimizes the L2 norm of the error ||Ax-b||.
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test_lls, a FORTRAN90 code which implements linear least squares (LLS) test problems which seek a vector x which minimizes the error in the rectangular linear system A*x=b.